Statistics Practice Test: answer key

Every answer, with a link to its step-by-step solution

#	Answer	Lesson	Solution
1	15	Bar charts and dot plots	Solved step by step
2	4	Bar charts and dot plots	Solved step by step
3	7	Histograms	Solved step by step
4	8	Histograms	Solved step by step
5	D mean ≈ 20.5	Mean of grouped data	Solved step by step
6	mean ≈ 1.8	Mean of grouped data	Solved step by step
7	C 30	Histograms with unequal class widths	Solved step by step
8	D 15	Histograms with unequal class widths	Solved step by step
9	P50 = 8	Percentiles	Solved step by step
10	percentile ≈ 54	Percentiles	Solved step by step
11	B 24.7	Cumulative frequency	Solved step by step
12	46.7	Cumulative frequency	Solved step by step
13	C 2 and 45	IQR and outliers	Solved step by step
14	0 and 30	IQR and outliers	Solved step by step
15	B SD ≈ 1.4	Standard deviation	Solved step by step
16	SD ≈ 3.2	Standard deviation	Solved step by step
17	A Positive correlation	Scatter plots and correlation	Solved step by step
18	A Positive correlation	Scatter plots and correlation	Solved step by step
19	D r = 1	The correlation coefficient	Solved step by step
20	r ≈ 0.716	The correlation coefficient	Solved step by step
21	y = x + 1.4	Line of best fit	Solved step by step
22	y = −0.59x + 56.7	Line of best fit	Solved step by step
23	1	Residuals	Solved step by step
24	−2	Residuals	Solved step by step
25	B Exponential	Linear or exponential model from a scatterplot	Solved step by step
26	B Exponential	Linear or exponential model from a scatterplot	Solved step by step
27	A 68%	The normal curve	Solved step by step
28	81.5%	The normal curve	Solved step by step
29	A 1.5	z-scores	Solved step by step
30	180	z-scores	Solved step by step
31	A Yes	Margin of error	Solved step by step
32	B No	Margin of error	Solved step by step

Grade

Count your right answers and divide by the number of questions: A 90% or more, B 80%, C 70%, D 60%, F below 60%.